Ethyl 3-(difluoromethyl)-2-nitro-6-(trifluoromethoxy)pyridine-5-acetate
Ethyl 3-(difluoromethyl)-2-nitro-5-(trifluoromethoxy)pyridine-4-acetate
Methyl 2-(fluoromethyl)-4-methoxy-6-(trifluoromethoxy)pyridine-3-acetate
Ethyl 2-(difluoromethyl)-6-nitro-4-(trifluoromethoxy)pyridine-3-acetate